Graphics Library >> Ecosystem

Tag: Ecosystem

Indications of structural changes in the marine ecosystem, catch ratios of predatory and plankton feeding fish
Three-quarters of fish stocks are currently exploited to the maximum extent, if not excessively. The Northeast Atlantic Ocean continues to exhibit declining catches, as well as a shift towards fish at lower levels in the...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Indications of structural changes in the marine ecosystem, catch ratios of predatory and plankton feeding fish
Three-quarters of fish stocks are currently exploited to the maximum extent, if not excessively. The Northeast Atlantic Ocean continues to exhibit declining catches, as well as a shift towards fish at lower levels in the...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Renewable freshwater supplies, per river basin
Freshwater represents a crucial sort for human development, for nature and for ecosystem services. This graphic compares freshwater supplies in cubic metres per capita, per river basin in 1995 with a projection of freshw...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Renewable freshwater supplies, per river basin
Freshwater represents a crucial sort for human development, for nature and for ecosystem services. This graphic compares freshwater supplies in cubic metres per capita, per river basin in 1995 with a projection of freshw...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Nigeria and the freshwater challenge
Out of the total precipitation reaching Nigeria, it can be separated into green and blue water. Green water (79% of the precipitation) represents the fraction of rainfall that generates soil moisture and which supports t...
02 Nov 2006 - by Hugo Ahlenius, UNEP/GRID-Arendal
Nigeria and the freshwater challenge
Out of the total precipitation reaching Nigeria, it can be separated into green and blue water. Green water (79% of the precipitation) represents the fraction of rainfall that generates soil moisture and which supports t...
02 Nov 2006 - by Hugo Ahlenius, UNEP/GRID-Arendal
Origin and destination of selected invasive/alien species
Invasive and alien species that are brought into a new environment, either on purpose or by accident, can quickly exploit ecological niches that are not fully covered by indigenous (local) species. They will then quickly...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Origin and destination of selected invasive/alien species
Invasive and alien species that are brought into a new environment, either on purpose or by accident, can quickly exploit ecological niches that are not fully covered by indigenous (local) species. They will then quickly...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Origin and destination of selected invasive/alien species
Invasive and alien species that are brought into a new environment, either on purpose or by accident, can quickly exploit ecological niches that are not fully covered by indigenous (local) species. They will then quickly...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
How the comb-jelly (Mnemiopsis leidyi) is spreading through European seas (invasive species)
The most threatening event for the Caspian ecosystem was the arrival of the North American comb jelly (Mnemiopsis leidyi). It was brought accidentally to the Caspian in the ballast water of oil tankers. Invasive and alie...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
How the comb-jelly (Mnemiopsis leidyi) is spreading through European seas (invasive species)
The most threatening event for the Caspian ecosystem was the arrival of the North American comb jelly (Mnemiopsis leidyi). It was brought accidentally to the Caspian in the ballast water of oil tankers. Invasive and alie...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
How the comb-jelly (Mnemiopsis leidyi) is spreading through European seas (invasive species)
The most threatening event for the Caspian ecosystem was the arrival of the North American comb jelly (Mnemiopsis leidyi). It was brought accidentally to the Caspian in the ballast water of oil tankers. Invasive and alie...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Biodiversity loss: state and scenarios 2006 and 2050
These projections of biodiversity loss from 2000 to 2050 were produced by the GLOBIO consortium for UNEP's Global Environment Outlook 4. Across the GEO scenarios and regions, global biodiversity continues to be threatene...
26 Jan 2006 - by Hugo Ahlenius, UNEP/GRID-Arendal
Uganda: quantifying the importance of environment and natural resources
Estimations calculate that the environment and natural resources sector should contribute USD 791 million to the Uganda GDP, excluding benefits like ecosystem services. In the formal figures, only USD 405 million is reco...
02 Nov 2006 - by Hugo Ahlenius, UNEP/GRID-Arendal
Arctic delta pond ecosystems, seasonal flooding and adaptation
The physical development and ecosystem health of river deltas in cold regions are strongly controlled by ice processes and thus are highly susceptible to the effects of climate change. As an example, the photograph shows...
01 Nov 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Forest systems
Forest systems are lands dominated by trees; they are often used for timber, fuelwood, and non-wood forest products. The map shows areas with a canopy cover of at least 40% by woody plants taller than 5 meters.
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Economic benefits under alternate management practices
In each case, the net benefits from the more sustainably managed ecosystem are greater than those from the converted ecosystem, even though the private (market) benefits would be greater from the converted ecosystem.
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Growth in number of marine species introductions
Number of new records of established non-native invertebrate and algal species reported in marine waters of North America, shown by date of first record, and number of new records of non-native marine plant species repor...
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Inland water and mountain systems
Inland water systems are permanent water bodies inland from the coastal zone and areas whose properties and use are dominated by the permanent, seasonal, or intermittent occurrence of flooded conditions. Inland waters in...
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Trend in mean depth of catch since 1950
Fisheries catches increasingly originate from deep areas. Over the years due to depletion in fish stocks the fishing industry has resorted to fishing at greater depths and increasing the damage to fish stocks and the oce...
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Previous | 1 2 3 4 5 | Next